 The position of sau was primarily tied into Rotuma’s pre-Christian fertility cult and the worship of the supreme deity Tagroa Siria.This is reflected in the fact that each reign was generally for the six-month ritual cycle of the Rotuman calendar.At the beginning of each sau's reign, they would be installed by the fakpure or secular ruler, and would subsequently be deified for six months, in the polity's hope that the appeasement of the sau, as a proxy for the God on earth, would result in prosperity and peace on the island.